passwella.
Menu

WAEC Mathematics 1994 Question 49

Question 49

Probability

Find the probability that a number selected from the numbers 30 to 50 inclusive is a prime.

  1. A.1/4
  2. B.5/21
  3. C.2/7
  4. D.3/10
  5. E.1/3
Show the answer and explanation

Answer: B (5/21)

Explanation

There are 21 numbers from 30 to 50. The primes are 31, 37, 41, 43 and 47, so the probability is 5/21.